Exercises
1. List the common applications of directional drilling.
Solution
Common applications of directional drilling are:
- drilling multiple wells from a platform, shoreline or other single surface location,
- drilling under mountainous terrain, urban locations, or other surface obstructions,
- offsetting to attain minimum cost drilling,
- drilling relief wells to control blowouts,
- sidetracking or straightening,
- redrilling or re-entering from existing well bores,
- bypassing potential problem formations, such as salt domes,
- improving reservoir performance through the use of horizontal wells,
- drilling under riverbeds for pipeline installation.
2. List four benefits of horizontal wells.
Solution
Benefits of horizontal wells:
- increasing formation exposure,
- improving well deliverability,
- eliminating water and gas coning,
- reducing overall development costs.
Assessment
1. The most common application of directional drilling is:
A .Side tracking
B .Relief wells
C .Bypassing problematic zones
D .Offshore development ✔
2. Horizontal drilling is a type of directional drilling most commonly used to:
A .Side track wells
B .Drill under riverbeds
C .Increase formation exposure ✔
D .Drill relief wells
3. Which of these statements is TRUE?
A .Controlled directional drilling originally grew out of efforts to control natural wellbore deviation. ✔
B .Non-directional or “vertical” wells generally exhibit no significant changes in hole angle or direction.
C .A and B are both true.
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